relativisation vs relativization

relativisation and relativization both are nouns.

Word	Noun	Adjective	Verb	Adverb
relativisation	Yes	No	No	No
relativization	Yes	No	No	No

As nouns, relativisation and relativization are synonyms defined as:

relativisation and relativization: the act or result of making relative or regarding as relative rather than absolute.

relativisation (noun)	relativization (noun)
the act or result of making relative or regarding as relative rather than absolute.	the act or result of making relative or regarding as relative rather than absolute.